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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b056085e47299e2fb5ebe6fce0a3e4a1d4479e09ea44048c58d6d650f592474a' 
  AND token = 'ht0d8+5eLLRJhJEhktFz/VG/tS7TbT2z0y97qtzYqXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}